fix: surface errors as tool errors and stop vacuous passes - #33
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Input, path, and config problems were raised as plain ValueError (or escaped from commit-check as TOMLDecodeError/ValueError), which the mcp 2.x tool manager reports to the client only as the generic "Error executing tool <name>". Every such failure now raises ToolError with the same message, and config merging / RuleBuilder construction report a malformed or rejected config as "invalid commit-check config: <detail>", so an agent can read what to correct. validate_repository_state validated an empty string instead of HEAD's message, so the message rules always passed. The message helper now accepts None and repository-state passes None, which makes commit-check read the latest commit (git log -1) as the CLI does; the author path already worked that way. A repo_path that is a plain directory silently produced a pass because commit-check's git reads come back empty. Tools that consult git (branch, author, or push_refs omitted; validate_repository_state) now require `git rev-parse --show-toplevel` to succeed in that directory and raise "repo_path is not a git repository: <path>" otherwise. Tools that validate a supplied value still work with a non-git directory that only holds a config file. A blank push_refs (e.g. " ") stripped to "" and passed with no ref and no upstream fallback. It is now rejected with "push_refs cannot be empty when provided", consistent with how the other tools treat blank strings. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018xYa7m3qup5wyN5MaXFgf6
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Additional details and impacted files@@ Coverage Diff @@
## main #33 +/- ##
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- Coverage 100.00% 99.13% -0.87%
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Files 2 2
Lines 205 232 +27
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+ Hits 205 230 +25
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📝 WalkthroughWalkthroughThe server now returns MCP ChangesValidation behavior
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The validation behavior supports plain directories when all Git-backed values are supplied, but the README implies those calls always fail. This documentation inconsistency may cause incorrect integration usage, but does not affect runtime correctness. Sequence Diagram(s)sequenceDiagram
participant MCPClient
participant validate_repository_state
participant _require_git_repo
participant Git
MCPClient->>validate_repository_state: call without repository values
validate_repository_state->>_require_git_repo: verify repo_path
_require_git_repo->>Git: git rev-parse --show-toplevel
Git-->>_require_git_repo: repository root or failure
validate_repository_state->>Git: read HEAD commit state
Git-->>validate_repository_state: message, author, and branch
validate_repository_state-->>MCPClient: validation result or ToolError
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 64 functions across 2 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@README.md`:
- Around line 53-57: Update the README description of non-Git repo_path errors
to qualify that they occur only when the tool must read Git-backed values;
preserve plain directories as valid when all required Git-backed values are
supplied, matching the rule near the documented Git-state behavior.
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README.mdsrc/commit_check_mcp/server.pytests/test_server.py
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The error applies only when the tool has to read git state; a plain directory holding a config file is still fine when every value is supplied, as the Tool Usage note already says. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018xYa7m3qup5wyN5MaXFgf6
2 participants
What
Four fixes from the cross-repository review, all in
server.py, each with a regression test.ValueError(or escaped from commit-check asTOMLDecodeError), which the mcp 2.x tool manager reports only asError executing tool <name>. They now raiseToolErrorwith the same message, and a malformed or rejected config is reported asinvalid commit-check config: <detail>. Tested throughmcp.call_toolso the text the client sees is what is asserted.validate_repository_statevalidates HEAD's message. It passed""to the message helper, so the message rules always passed. It now passesNone, which makes commit-check read the latest commit as the CLI does. Tested with a realgit initrepository.repo_pathis rejected where the tool has to read git state (branch, author or push refs omitted, or repository state). Tools given every value still work on a plain directory holding a config file.push_refsis an error instead of a vacuous pass, consistent with how the other tools treat blank strings.Behaviour changes
validate_repository_statecan now fail on a bad HEAD message.repo_pathis omitted) is an error for the git-consulting calls.README updated for all three. 87 tests pass.
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Summary by CodeRabbit
Bug Fixes
Documentation